FakeVim command text field improvements

FakeVim is really great and having some facilities would make it even more productive and cute.

1. Add the vim command text field to be visible on active qt creator window, not only the main because the main is not always visible to an user.
2. Increase the width of the command window because for long command is really awful to not see the most part of it
3. Make it possible to copy, paste in the command window